- Joined
- Jun 25, 2004
- Messages
- 929
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I made a judgement call and I will own it. It is riding season and the engine was performing fine other than the cam issue. I saw no reason to pull the head.And if you torqued a chilled iron cam to anywhere near 50 ft/lbs that would be the source of the breakage. Limit is 20 ft/lbs.
Interesting idea to save your self the effort of taking off the head, but when you said it was last built in 2005, as if it was just last year, I chuckled a bit.
Don't you think it would be interesting to see how your valves are holding up on their seats after 17 years, and maybe change the valve stem seals?
I confess I have stripped my race engine enough times since 2015 that I wouldn't even think to do it that way, but of course, with through bolts I couldn't anyway!.
Yup, my bad on over torquing the chilled iron cam. I was not even aware that the cam was chilled iron, and there was no warning of lowering the torque of this nut accordingly. The shop manual that I have doesn’t even list a torque on the cam nut. Expensive lesson, but such is life…
The new one is nitrided EN40B, so I felt comfortable with that torque on a 3/4” thread.
I don't know about you, but 2005 sure feels like yesterday!! LOL!!
Now, what if I were to tell you that my Combat motor has not been opened up since 1975?? The horror - lol!!
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